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Simulation of Liquid Movement in Soil Following Pocket Injection
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Transactions of the ASABE. 55(1): 85-92. (doi: 10.13031/2013.41256) @2011
Authors: S. Ai, Y. Chen, Q. Zhang
Keywords: Flow, Hydrus-2D, Manure, Pocket injection, Soil
Knowledge of the movement of liquid manure in soil is essential in assessing the agronomic and environmental impacts of manure injection and guiding the design of manure injectors. In this study, a two-dimensional model was developed to simulate liquid flow in a sandy soil following pocket injection. The Hydrus-2D software package was used for the model computation. The simulation required the dimensions of the soil pocket as an input. Thus, field measurements were carried out to determine the shapes of the pockets created by typical rolling tines (from an AerWay aerator). Field measurements were also performed on liquid distribution zones to evaluate the model. The model domain consisted of two materials representing disturbed soil (soil pocket area) and undisturbed soil. These two materials were given different soil bulk densities and initial water contents. The simulation results showed that water movement occurred both laterally and vertically within the model domain over time. At approximately 500 s, water movement nearly stopped, and the water infiltration zones at this simulation point were comparable with some of those measured in the field in terms of both shape and dimensions.(Download PDF) (Export to EndNotes)